强耦合下磁性夸克-胶子等离子体的电导率
Conductivities of magnetic quark-gluon plasma at strong coupling
摘要：
在强磁场中，夸克-胶子等离子体被磁化，导致输运系数各向异性。在这项工作中，我们专注于磁化对电导率的影响，忽略了轴向异常的可能贡献。我们将纵向和横向电导率推广到有限频率。对于横向电导率，需要将贡献与流体速度分离。利用全息磁膜模型研究了电导率随磁场和频率的变化关系。纵向电导率在磁场中大致线性地缩放，而横向电导率对磁场相当不敏感。此外，我们发现，电导率可以显着提高在大的频率。这可能会延长磁场的寿命，这是手性磁效应的关键组成部分。
英文摘要：
In the presence of a strong magnetic field, the quark gluon plasma is magnetized, leading to anisotropic transport coefficients. In this work, we focus on the effect of magnetization on electric conductivity, ignoring the possible contribution from the axial anomaly. We generalize longitudinal and transverse conductivities to finite frequencies. For transverse conductivity, a separation of contribution from fluid velocity is needed. We study the dependence of the conductivities on the magnetic field and frequency using a holographic magnetic brane model. The longitudinal conductivity scales roughly linearly in the magnetic field, while the transverse conductivity is rather insensitive to the magnetic field. Furthermore, we find the conductivities can be significantly enhanced at large frequency. This can possibly extend the lifetime of the magnetic field, which is a key component of the chiral magnetic effect.
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